“When I was one-and-twenty
I heard a wise man say,
"Give crowns and pounds and guineas
But not your heart away."”
No. 13, st. 1.
A Shropshire Lad (1896)
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A.E. Housman 69
English classical scholar and poet 1859–1936Related quotes

"1901", p. 76. Sometimes misquoted as "If fifty million people say a foolish thing, it is still a foolish thing". Sometimes misattributed to Bertrand Russell or Anatole France
A Writer's Notebook (1946)

W. Somerset Maugham, A Writer's Notebook (1949), entry for 1901
Sometimes misquoted as "If fifty million people say a foolish thing, it is still a foolish thing."
Sometimes misattributed to Anatole France
Note that Russell does say something similar in Marriage and Morals (1929): "The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widespread belief is more likely to be foolish than sensible."
Misattributed

“When a wise man does not understand, he says: "I do not understand."”
The fool and the uncultured are ashamed of their ignorance. They remain silent when a question could bring them wisdom.
The Godmakers (1972)

Source: Unsinkable : A Memoir (2013), Chapter 16. Bottoming Out in Beverley Hills